Polyurethane O-Rings - Cast Urethane O-Rings
Polyurethane rubber is a thermoplastic elastomer formed by reacting a polyol with a diisocyanate or a polymeric isocyanate in the presence of suitable catalysts and additives. Polyurethane rubber is widely used due to its high strength, and excellent tear and abrasion resistance. Polyurethane also provides excellent permeation resistance.
Polyurethane o-rings from Marco Rubber are in-stock and ready to ship today. Leverage the direct purchasing power of the world's largest o-ring inventory network for fast shipping, low prices, and reliable service.
Popular compounds listed below and hundreds of other specialty compounds are available. Contact us to discuss custom specifications on polyurethane o-rings, which can usually be fulfilled without additional tooling fees within a few weeks.
Common Names
Urethane, AU, EU, PU
Trade Names
Adiprene®, Millathane®, Vibrathane®
Features
- Good hydraulic oil and gasoline resistance
- Resistant to pure aliphatic hydrocarbons (propane, butane, fuel)
- Resistance to mineral and silicone oils and greases
- Resistant to water, oxygen, ozone and aging
- Excellent tear and abrasion resistance
- Available in multiple types and compounds to meet performance and cost requirements
Specialty Resistances
- Some Petroleum Oils
- Some Hydrocarbon Fuels
- Oxygen / Ozone
Limitations
- Not resistant to Ketones (MEK)
- Not resistant to Acids
- Not resistant to Auto / Aircraft Brake Fluids
- Not resistant to Chlorinated Hydrocarbons
- Not resistant to Water
- Not compatible with acids, ketones, esters, ethers, alcohols, glycols
- Hot water, steam, alkalis and amines
Mechanical Properties
- Excellent Wear Resistance
- Poor Compression Set Resistance
- Excellent Short-Term Resilience
Polyurethane O-Ring Compatibility
Compound # | Datasheet | Color | Hardness (Shore A) | Low Temp °F (°C) | High Temp °F (°C) | Features |
|---|---|---|---|---|---|---|
 | Translucent | 70 | 250 (121) | -65 (-54) | High performance 70 durometer Polyurethane | |
| Translucent | 90 | 250 (121) | -65 (-54) | High performance 90 durometer Polyurethane | |
| Translucent | 90 | 180 (82) | -30 (-34) | General purpose 90 durometer Polyurethane | |
| Translucent | 70 | 180 (82) | -30 (-34) | General purpose 70 durometer Polyurethane |
The information on this page is to the best of our knowledge accurate and reliable. However, Marco Rubber makes no warranty, expressed or implied, that parts manufactured from this material will perform satisfactorily in the customer's application. It's the customer's responsibility to evaluate parts prior to use.
The temperature ranges presented on this page are approximations for dry air service only and should not be used to determine design specifications or end-use temperature limits. Actual temperature range of a compound in an end-use application is highly dependent on part type, hardware configuration, applied forces, chemical media, pressure and thermal cycling effects, and other factors. The most practical way of determining an end-use temperature range is testing in the actual application conditions. Consult a Marco Engineer for more details.
